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PROPERTY, PLANT, AND EQUIPMENT
 12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT, AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment consisted of the following (in thousands):
December 31, 2022December 31, 2021
Land$172,579 $165,010 
Asset retirement costs (non-landfill)22,001 19,105 
Landfill assets232,872 205,873 
Buildings and improvements (1)
584,916 551,795 
Camp equipment116,976 127,680 
Vehicles (2)
1,112,188 912,836 
Equipment (3)
2,078,088 2,092,395 
Furniture and fixtures6,481 6,444 
Construction in progress140,328 60,447 
4,466,429 4,141,585 
Less - accumulated depreciation and amortization2,486,127 2,278,410 
Total property, plant and equipment, net$1,980,302 $1,863,175 
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(1) Balances inclusive of gross ROU assets classified as finance leases of $8.0 million and $8.9 million, respectively.
(2) Balances inclusive of gross ROU assets classified as finance leases of $106.7 million and $77.7 million, respectively.
(3) Balances inclusive of gross ROU assets classified as finance leases of $9.2 million and $9.3 million, respectively.
Depreciation expense, inclusive of landfill and finance lease amortization was $297.4 million, $263.4 million and $257.1 million for the years ended December 31, 2022, 2021 and 2020, respectively. The Company recorded $3.4 million of capitalized interest in 2022, mainly attributable to the construction of a new incinerator in Kimball, Nebraska. Capitalized interest in 2021 and 2020 was negligible.